#638D33
Closest named color: Moss Green (#658B38). oklch(59.3% 0.128 130.7), rgb(99, 141, 51).
Aa
Black text reads best on this color (5.38:1).
About this color
#638D33 is a medium-dark, moderately saturated green. In OKLCH its lightness is 59%, its chroma 0.128 and its hue 131°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Moss Green (#658B38), ΔE 0.009 away. Black text reads best on it, at 5.38:1.
| Hue family | Greens |
| Lightness | medium-dark (59%) |
| Chroma | moderately saturated (0.128) |
| Temperature | in between |
| Nearest name | Moss Green (#658B38) |
| Black text | 5.38:1 |
| White text | 3.89:1 |
Values
| HEX | #638D33 |
| RGB | rgb(99, 141, 51) |
| HSL | hsl(88, 47%, 38%) |
| OKLCH | oklch(59.3% 0.128 130.7) |
Contrast
WCAG 2 contrast ratios are the conformance target: AA needs 4.5:1 for body text and 3:1 for large text, AAA needs 7:1. APCA Lc values are supplementary guidance from the WCAG 3 drafts.
| Pair | WCAG 2 | Result | APCA | APCA guidance |
|---|---|---|---|---|
| White text on #638D33 | 3.89:1 | AA large text | Lc -71.8 | Content text, not long reading |
| Black text on #638D33 | 5.38:1 | AA | Lc 37.8 | Non-text elements, placeholder text |
| #638D33 text on white | 3.89:1 | AA large text | Lc 66.3 | Content text, not long reading |
| #638D33 text on black | 5.38:1 | AA | Lc -35.4 | Non-text elements, placeholder text |
Tints and shades
A 50–950 scale built in OKLCH: the hue is held, lightness follows a Tailwind v4-like curve, and every step is kept inside the sRGB gamut. This color sits at step 600.
-
Step 50
50
#F4F7F1
oklch(97.2% 0.009 128.6)
-
Step 100
100
#E6ECE1
oklch(93.5% 0.016 130.4)
-
Step 200
200
#D2DEC8
oklch(88.5% 0.032 130.6)
-
Step 300
300
#B4C9A2
oklch(81% 0.058 130.7)
-
Step 400
400
#8DAD6F
oklch(70.8% 0.093 130.6)
-
Step 500
500
#709847
oklch(63.2% 0.119 130.9)
-
Step 600
600 (this color)
#638D33
oklch(59.3% 0.128 130.7)
-
Step 700
700
#486E18
oklch(49.2% 0.121 130.9)
-
Step 800
800
#3C5917
oklch(42.6% 0.099 130.2)
-
Step 900
900
#334A1A
oklch(37.8% 0.078 130.8)
-
Step 950
950
#1E2B10
oklch(26.9% 0.049 130.3)
#638D33 with color blindness
Simulated with the Machado et al. (2009) model. ΔE is how far the color moves: below about 0.02 you would not notice a change.
| Vision | Seen as | Shift (ΔE) |
|---|---|---|
| Protanopia (no red cones) | #938328 | 0.069 |
| Deuteranopia (no green cones) | #8D803A | 0.070 |
| Tritanopia (no blue cones) | #65877A | 0.099 |
| Achromatopsia (no color) | #818181 | 0.129 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #638D33
#638D33
oklch(59.3% 0.128 130.7)
- #9666B6
#9666B6
oklch(59.3% 0.128 310.6)
Analogous
Neighbouring hues, 30° either side.
Split complementary
The two hues beside the complement (150° and 210°).
Triadic
Three hues spaced 120° apart.
Palettes with this color
Curated palettes that contain a color within ΔE 0.04 (OKLab) of #638D33, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Moss Green #658B38 ΔE 0.009
- Mossy Green #638B27 ΔE 0.010
- Olive Drab #6B8E23 ΔE 0.015
- Fern Green #548D44 ΔE 0.021
- Sap Green #5C8B15 ΔE 0.023
- Khaki Green #728639 ΔE 0.030
- Dark Yellow Green #728F02 ΔE 0.030
- Swamp Green #748500 ΔE 0.031
Use #638D33 in your product
Turn it into light and dark UI roles checked for contrast, then export to Tailwind v4, shadcn/ui, CSS or design tokens.